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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
;-)
That feeling when you catch the one elusive bug and solve the puzzle
It's not so much that the kata had far fewer tests, it's that the given translation was authored by someone else. Looks like you completed this in C++; I didn't enforce any fixed number of tests for the C++ (or Java) translation but I trust the authors' judgment for their respective languages.
The optimization requirement is not really tight. If you can run 500 puzzles in under a second, your solution should be fine.
Have you printed too much stuff to stdout? Because that's known to cause problems.